Resistance training positively impacts bone density by creating mechanical stress on the bones during weight-bearing exercises. This stress stimulates the activity of osteoblasts, the cells responsible for bone formation, thus enhancing bone mineral density. Improved bone strength is vital in reducing the risk of fractures and osteoporosis later in life. Incorporating resistance training into a fitness regimen can therefore contribute to lifelong skeletal health. It is particularly beneficial for individuals at risk of bone density loss due to factors like age or hormonal changes.